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United States Department of Agriculture: A cabinet department in the Executive Branch of the United States Government concerned with improving and maintaining farm income and developing and expanding markets for agricultural products. Through inspection and grading services it safeguards and insures standards of quality in food supply and production.

Using a pH Meter

JoVE 5500

Source: Laboratory of Dr. Zhongqi He - United States Department of Agriculture

Acids and bases are substances capable of donating protons (H+) and hydroxide ions (OH-), respectively. They are two extremes that describe chemicals. Mixing acids and bases can cancel out or neutralize their extreme effects. A substance that is neither acidic nor basic is neutral. The values of proton concentration ([H+]) for most solutions are inconveniently small and difficult to compare so that a more practical quantity, pH, has been introduced. pH was originally defined as the decimal logarithm of the reciprocal of the molar concentration of protons , but was updated to the decimal logarithm of the reciprocal of the hydrogen ion activity . The former definition is now occasionally expressed as p[H]. The difference between p[H] and pH is quite small. It has been stated that pH = p[H] + 0.04. It is common practice to use the term 'pH' for both types of measurements. The pH scale typically ranges from 0 to 14. For a 1 M solution of a strong acid, pH=0 and for a 1 M solution of a strong base, pH=14. Thus, measured pH values will lie mostly in the rang


 General Chemistry

Glass Wool Filters for Concentrating Waterborne Viruses and Agricultural Zoonotic Pathogens

1Wisconsin Water Science Center, United States Geological Survey, 2University of Wisconsin – Madison, 3Agricultural Research Service, United States Department of Agriculture, 4Alaska Science Center, United States Geological Survey

JoVE 3930


 Immunology and Infection

The Hawaii Protocol for Scientific Monitoring of Coffee Berry Borer: a Model for Coffee Agroecosystems Worldwide

1Oak Ridge Institute for Science and Education, 2Daniel K. Inouye US Pacific Basin Agricultural Research Center, United States Department of Agriculture-Agricultural Research Service, 3College of Tropical Agriculture and Human Resources, University of Hawaii at Manoa, 4Independent Consultant on CBB Management

JoVE 57204


 Environment

Detection of Viruses from Bioaerosols Using Anion Exchange Resin

1High Plains Intermountain Center for Agricultural Health and Safety, Department of Environmental and Radiological Health Sciences, Colorado State University, 2National Wildlife Research Center, Wildlife Services, Animal and Plant Health Inspection Service, United States Department of Agriculture, 3Western Sydney University, 4Leprino Foods, Inc, 5Department of Food Science and Agricultural Chemistry, McGill University, 6Department of Mechanical Engineering, Colorado State University, 7Department of Animal Science, University of Wyoming

JoVE 58111


 Environment

Novel Photoacoustic Microscopy and Optical Coherence Tomography Dual-modality Chorioretinal Imaging in Living Rabbit Eyes

1Kellogg Eye Center, Department of Ophthalmology and Visual Sciences, University of Michigan, 2Department of Biomedical Engineering, University of Michigan, 3Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, 4Department of Radiology, University of Michigan

JoVE 57135


 Engineering

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data

1Crops Pathology and Genetics Research Unit, United States Department of Agriculture-Agricultural Research Service, 2Department of Viticulture & Enology, University of California, Davis, 3Faculty of Agricultural Sciences, University of Chile, 4Atmospheric Science, University of California, Davis, 5URS Corporation Australia Pty. Ltd.

JoVE 50666


 Environment

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

1Institute for Critical Technology and Applied Science, Virginia Tech, 2Macromolecules and Interfaces Institute, Virginia Tech, 3Institute for Food Safety and Health, Illinois Institute of Technology- Moffett Campus, 4Wood, Cellulose, and Paper Research Department, University of Guadalajara, 5Department of Sustainable Biomaterials, Virginia Tech, 6Sustainable Nanotechnology Interdisciplinary Graduate Education Program, Virginia Tech

JoVE 51257


 Chemistry

Application of Long-term cultured Interferon-γ Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle

1Infectious Bacterial Diseases Research Unit, National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, 2Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, 3UK Veterinary Laboratories Agency, 4Visual Services, National Centers for Animal Health, Animal and Plant Health Inspection Service, United States Department of Agriculture

JoVE 52833


 Immunology and Infection

A Novel Microsurgical Model for Heterotopic, En Bloc Chest Wall, Thymus, and Heart Transplantation in Mice

1Johns Hopkins University School of Medicine, 2Burn and Complex Wound Center, 3Section of Plastic and Reconstructive Surgery, University of Chicago Medical Center, 4Division of Plastic, Reconstructive, and Maxillofacial Surgery, R Adams Cowley Shock Trauma Center, 5Department of Plastic and Reconstructive Surgery, Johns Hopkins University School of Medicine, 6Vascularized Composite Allotransplantation (VCA) Lab, Johns Hopkins University School of Medicine

JoVE 53442


 Medicine

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